export function pv() {
    tracker.send({
        kind: 'business',
        type: 'pv',
        startTime: performance.now(),
        pageURL: location.href,
        referrer: document.referrer,
        uuid: getUUID(),
    })

    let startTime = Date.now()
    // visibilitychange
    window.addEventListener('beforeunload', function () {
        let stayTime = Date.now() - startTime
        tracker.send({
            kind: 'business',
            type: 'stayTime',
            stayTime,
            pageURL: location.href,
            uuid: getUUID(),
        })
    }, false)
}
